Balancing is a major issue due to our pathetic roads. Secondly, vehicles used usually r not tht much capable to handle 120+. In accordance with my experiance, Mehran, Alto, Khyber, Cultus, Corolla Passion, Suzuki Potohar, Suzuki Baleno and Coure dont perform well above 120kmh on highway.
SUV's perform quite well as Toyo Surf SSRX, Hilux SSRX, Patrol, Nissan Twin Cab, M38 with Radial, CJ with Radial, LC, Mutt with Radial, JEEP Cherokee and Ford 350.
Thnx.